Sinusoidal fetal heart rate pattern associated with gastroschisis.

A case of true sinusoidal fetal heart rate associated with fetal gastroschisis is presented. No other known etiologic factors associated with a sinusoidal pattern were present. The pathophysiologic mechanism in this case is unclear, but fetal anomalies may be associated with elevated arginine vasopressin levels leading to the distinctive sinusoidal fetal heart rate response.